FastFlow: Fasting Tracker
Fasting with live biometrics
About
This app guides you through intermittent fasting using real-time biometric data from a compatible Garmin watch. It visualizes your body's metabolic stages and suggests activities, offering a personalized approach to fasting and breaking your fast.
What's New in FastFlow
1.0
July 16, 2026
Subscriptions & In-App Purchases
Annual
1 year subscription
Developer apps
FAQ
What is FastFlow?
FastFlow is a general wellness and fasting-tracking app that uses live biometric data from a compatible Garmin watch to guide users through intermittent fasting.
Does FastFlow have ads?
No, FastFlow does not contain advertisements. The app is designed with privacy in mind, processing and storing your data on your device.
What devices does FastFlow support?
FastFlow is currently supported on iPhone. Live biometric sync requires a compatible Garmin watch with the FastFlow watch app.
How much does FastFlow cost?
FastFlow is free to download and use with basic features. A subscription is required to unlock live Garmin biometric sync, full history, and insights, with monthly and annual plans available.
What are the subscription options for FastFlow?
FastFlow offers monthly and annual subscription plans. The monthly plan is $4.99 and the annual plan is $39.99, with a free trial period available.
How can I manage or cancel my FastFlow subscription?
You can manage or cancel your FastFlow subscription at any time in your App Store account settings. Subscriptions renew automatically unless turned off at least 24 hours before the end of the current period.
Is FastFlow a medical device?
No, FastFlow is a general wellness app and not a medical device. It does not provide medical advice, diagnosis, or treatment. Always consult your doctor before making any health decisions.
How does FastFlow use my Garmin data?
FastFlow uses your live heart rate, HRV, Body Battery, and stress data from a compatible Garmin watch to map your fast through six metabolic stages, showing you what's happening inside your body.
